Connected: An Internet Encyclopedia
RFC 1661 - 5.4. Configure-Reject

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### 5.4. Configure-Reject

Description

  If some Configuration Options received in a Configure-Request are not recognizable or are not acceptable for negotiation (as configured by a network administrator), then the implementation MUST transmit a Configure-Reject. The Options field is filled with only the unacceptable Configuration Options from the Configure-Request. All recognizable and negotiable Configuration Options are filtered out of the Configure-Reject, but otherwise the Configuration Options MUST NOT be reordered or modified in any way.

  On reception of a Configure-Reject, the Identifier field MUST match that of the last transmitted Configure-Request. Additionally, the Configuration Options in a Configure-Reject MUST be a proper subset of those in the last transmitted Configure- Request. Invalid packets are silently discarded.

  Reception of a valid Configure-Reject indicates that when a new Configure-Request is sent, it MUST NOT include any of the Configuration Options listed in the Configure-Reject.

A summary of the Configure-Reject packet format is shown below. The fields are transmitted from left to right.

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |     Code      |  Identifier   |            Length             |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Options ...
       +-+-+-+-+

Code

  4 for Configure-Reject.

Identifier

  The Identifier field is a copy of the Identifier field of the Configure-Request which caused this Configure-Reject.

Options

  The Options field is variable in length, and contains the list of zero or more Configuration Options that the sender is rejecting. All Configuration Options are always rejected simultaneously.

Next: 5.5. Terminate-Request and Terminate-Ack

Connected: An Internet Encyclopedia
RFC 1661 - 5.4. Configure-Reject